125 lines
3.2 KiB
C++
125 lines
3.2 KiB
C++
// Boost.Units - A C++ library for zero-overhead dimensional analysis and
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// unit/quantity manipulation and conversion
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//
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// Copyright (C) 2003-2008 Matthias Christian Schabel
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// Copyright (C) 2008 Steven Watanabe
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//
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// Distributed under the Boost Software License, Version 1.0. (See
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// accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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/**
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\file
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\brief conversion.cpp
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\details
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Test explicit and implicit unit conversion.
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Output:
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@verbatim
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//[conversion_output_1
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L1 = 2 m
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L2 = 2 m
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L3 = 2 m
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L4 = 200 cm
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L5 = 5 m
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L6 = 4 m
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L7 = 200 cm
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//]
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//[conversion_output_2
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volume (m^3) = 1 m^3
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volume (cm^3) = 1e+06 cm^3
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volume (m^3) = 1 m^3
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energy (joules) = 1 J
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energy (ergs) = 1e+07 erg
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energy (joules) = 1 J
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velocity (2 m/s) = 2 m s^-1
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velocity (2 cm/s) = 0.02 m s^-1
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//]
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@endverbatim
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**/
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#include <iostream>
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#include <boost/units/io.hpp>
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#include <boost/units/pow.hpp>
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#include <boost/units/systems/cgs.hpp>
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#include <boost/units/systems/cgs/io.hpp>
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#include <boost/units/systems/si.hpp>
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#include <boost/units/systems/si/io.hpp>
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using namespace boost::units;
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int main()
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{
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// test quantity_cast
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{
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// implicit value_type conversions
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//[conversion_snippet_1
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quantity<si::length> L1 = quantity<si::length,int>(int(2.5)*si::meters);
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quantity<si::length,int> L2(quantity<si::length,double>(2.5*si::meters));
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//]
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//[conversion_snippet_3
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quantity<si::length,int> L3 = static_cast<quantity<si::length,int> >(L1);
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//]
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//[conversion_snippet_4
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quantity<cgs::length> L4 = static_cast<quantity<cgs::length> >(L1);
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//]
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quantity<si::length,int> L5(4*si::meters),
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L6(5*si::meters);
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quantity<cgs::length> L7(L1);
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swap(L5,L6);
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std::cout << "L1 = " << L1 << std::endl
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<< "L2 = " << L2 << std::endl
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<< "L3 = " << L3 << std::endl
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<< "L4 = " << L4 << std::endl
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<< "L5 = " << L5 << std::endl
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<< "L6 = " << L6 << std::endl
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<< "L7 = " << L7 << std::endl
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<< std::endl;
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}
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// test explicit unit system conversion
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{
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//[conversion_snippet_5
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quantity<si::volume> vs(1.0*pow<3>(si::meter));
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quantity<cgs::volume> vc(vs);
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quantity<si::volume> vs2(vc);
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quantity<si::energy> es(1.0*si::joule);
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quantity<cgs::energy> ec(es);
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quantity<si::energy> es2(ec);
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quantity<si::velocity> v1 = 2.0*si::meters/si::second,
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v2(2.0*cgs::centimeters/cgs::second);
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//]
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std::cout << "volume (m^3) = " << vs << std::endl
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<< "volume (cm^3) = " << vc << std::endl
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<< "volume (m^3) = " << vs2 << std::endl
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<< std::endl;
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std::cout << "energy (joules) = " << es << std::endl
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<< "energy (ergs) = " << ec << std::endl
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<< "energy (joules) = " << es2 << std::endl
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<< std::endl;
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std::cout << "velocity (2 m/s) = " << v1 << std::endl
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<< "velocity (2 cm/s) = " << v2 << std::endl
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<< std::endl;
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}
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return 0;
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}
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